The demo to Ensemble Studios’ “Halo Wars” is now available on the Xbox 360. The download is a fairly hefty one and will require 1.4GB of disk space on your 360 hard drive. Here’s an excerpt from the game’s PR material:

Halo Wars is a strategy game based on the legendary universe of Halo. Command armies of UNSC units, both familiar and new, in their initial encounter against the Covenant, an alien coalition threatening to obliterate mankind. Experience an early period of the storied universe of Halo, in a time leading up to the first Halo game.

Halo Wars is set 20 years before the events of “Halo: Combat Evolved”. You can add the demo to your download queue by simply clicking this link (requires you to be signed on to to complete the process).